Undergarment gusset



FIG. 1 is a top rear perspective view of an undergarment gusset of the present invention, as it may be used in an undergarment (the undergarment is shown in broken lines and is not part of the claimed design);

FIG. 2 is a plan view;

FIG. 3 is a front elevational view;

FIG. 4 is a rear elevational view; and,

FIG. 5 is a right side elevational view (the left side elevation view is a mirror image thereof).

The broken lines shown on the undergarment gusset represent unclaimed features. 

The ornamental design for an undergarment gusset, substantially as shown and described. 